package com.yc.baihe.filters;

import java.io.IOException;
import java.io.PrintWriter;

import javax.servlet.Filter;
import javax.servlet.FilterChain;
import javax.servlet.FilterConfig;
import javax.servlet.ServletException;
import javax.servlet.ServletRequest;
import javax.servlet.ServletResponse;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import javax.servlet.http.HttpSession;

import com.yc.baihe.utils.SessionAttributeNames;

public class CheckAdminLoginFilter implements Filter {
	private String errorLogin="login.html";
	public void destroy() {
		
	}

	public void doFilter(ServletRequest arg0, ServletResponse arg1,FilterChain arg2) throws IOException, ServletException {
		HttpServletRequest request=(HttpServletRequest) arg0;
		HttpSession session=request.getSession();
		
		if(session.getAttribute(SessionAttributeNames.CURRENTUSERSINFO)==null){
			HttpServletResponse response=(HttpServletResponse) arg1;
			PrintWriter out=response.getWriter();
			response.setContentType("charset:utf-8;");
			String basePath = request.getScheme()+"://"+request.getServerName()+":"+request.getServerPort()+request.getContextPath()+"/"+errorLogin;
			out.print("<script>alert('请先登录');location.href='"+basePath+"';</script>");
			out.flush();
			out.close();
		}else{
			arg2.doFilter(arg0, arg1);
		}
	}

	public void init(FilterConfig arg0) throws ServletException {
		String path=arg0.getInitParameter("errorLogin");
		if(path!=null){
			errorLogin=path;
		}
	}

}
